overheating the c 2 crate

[Francis F.]

Re: overheating the c 2 crate

Ken ,I did not know that,how can I tell ? where is it identified?
Francis

[Ralph E.]

Re: overheating the c 2 crate

Ralph,yes seemed to be ok with other eng.,,rad hoses are new and look ok,I am now considering a radiator up-grade.checking B T U capacities a ainst exist copper/brass unit from the 90's.
I also noted in order to hold the temp between 200-225* the use of the cars heater on hi was necessary.
Francis

Appears you got the right advice earlier from Joe Ray. Change the Radiator.
Seems to me that if you are using the car's heater to supplement the radiator cooling and that it seems to work, a new correctly sized radiator will fix you woes.

[Kenneth B.]

Re: overheating the c 2 crate

I think there is a thread on here that explains how to change the spring or to find a 180. The more that you put the cooling system back to original the better you will be. GM knew what they are doing.

[Francis F.]

Re: overheating the c 2 crate

Ken, ok truth time....
" when all else fails..READ THE A.I.M. instruction man. As it turns out 66 corvettes with C 60 option the heater lines are different.From the intake man.(hot coolant line) is run to the control valve and from there it enters the heater core via the lower fitting,And from the top fitting of the heater core to a tee fitting one hose to the exp.tank and then teed fitting back to the water pump.upon looking at non A/C cars with only a heater core the piping is different.And I can tell you this arrangement makes a huge ! difference in operating temp..My temp is at a steady 160/180# the addition of a balancing t-stat.like the rob shaw/Mr gasket bought at pep boys adds assistance also...Thanks to all for your advice,Francis
yes bubba got me,

[Ralph E.]

Re: overheating the c 2 crate

Ken, ok truth time....
" when all else fails..READ THE A.I.M. instruction man. As it turns out 66 corvettes with C 60 option the heater lines are different.From the intake man.(hot coolant line) is run to the control valve and from there it enters the heater core via the lower fitting,And from the top fitting of the heater core to a tee fitting one hose to the exp.tank and then teed fitting back to the water pump.upon looking at non A/C cars with only a heater core the piping is different.And I can tell you this arrangement makes a huge ! difference in operating temp..My temp is at a steady 160/180# the addition of a balancing t-stat.like the rob shaw/Mr gasket bought at pep boys adds assistance also...Thanks to all for your advice,Francis
yes bubba got me,

Francis,
Glad you got it all fixed. Never notice you had AC

[Richard L.]

Re: overheating the c 2 crate

Ken, ok truth time....
" when all else fails..READ THE A.I.M. instruction man. As it turns out 66 corvettes with C 60 option the heater lines are different.From the intake man.(hot coolant line) is run to the control valve and from there it enters the heater core via the lower fitting,And from the top fitting of the heater core to a tee fitting one hose to the exp.tank and then teed fitting back to the water pump.upon looking at non A/C cars with only a heater core the piping is different.And I can tell you this arrangement makes a huge ! difference in operating temp..My temp is at a steady 160/180# the addition of a balancing t-stat.like the rob shaw/Mr gasket bought at pep boys adds assistance also...Thanks to all for your advice,Francis
yes bubba got me,

Francis...

Help me out as I'm a bit slow...

I don't have a '66 AIM so I believe you describing how the heater core coolant hoses should be installed on a C60 car...

What I'm having trouble understanding is where you would be getting the additional heat rejection that would be associated with routing the hoses per the AIM...

What am I missing here..???

(Glad that you got your problem fixed)...

Thanks...

Rick

[Joe R.]

Re: overheating the c 2 crate

Think changing the thermostat at the same time might have helped more than rerouting the two heater hoses?
Think so!

JR

[Francis F.]

Re: overheating the c 2 crate

Joe, yes it's possible.I also completely drained the coolant,even pulled the block plugs in order to get a proper refill ,in hopes of getting rid of an air pocket.used Duke's method, and the short answer is all running cool now.
P S I was at a car show yesterday ,3 A/C cars were there and all had the hose from the intake manifold going directly to the control valve,and top hose from heater to exp tank and then on to the water pump,just say'n.
thank's to all respondents....Francis

[John H.]

Re: overheating the c 2 crate

Joe, yes it's possible.I also completely drained the coolant,even pulled the block plugs in order to get a proper refill ,in hopes of getting rid of an air pocket.used Duke's method, and the short answer is all running cool now.
P S I was at a car show yesterday ,3 A/C cars were there and all had the hose from the intake manifold going directly to the control valve,and top hose from heater to exp tank and then on to the water pump,just say'n.
thank's to all respondents....Francis

Francis -

The coolant plumbing circuit for an A/C car is EXACTLY the same as for a non-A/C car, except the A/C car has the coolant shutoff valve. Both have the line from the intake manifold fitting to the lower heater core inlet, and both have the line from the upper heater core outlet through the tee at the expansion tank to the water pump inlet fitting. How the hoses are routed relative to each other has nothing to do with engine cooling performance.

[Gene M.]

Re: overheating the c 2 crate

Dewitt has another radiator option at a lower price:

http://www.summitracing.com/parts/dwr-1149063m?seid=srese1&gclid=CPWysbyI77wCFREaOgodYyEAdg

I have this Dewitt unit along with air and just got back from road tour over 4 thousand miles. The 107 degrees in Kansas was a bit warm on the 65 with 327 but did not go past the 3/4 mark on the temp gauge. Running at legal speeds in over drive with the air on was taxing on the car at 107 degrees but cycling air on and off got us thru it. Normal air temperatures were not an issue at all. I would not attempt a trip with temperatures in the 90's to 100's again if at all possible. Maybe a 7 blade fan would help some. But my 5 blade fan is fine for NORMAL temperature cruising.

[Francis F.]

Re: overheating the c 2 crate

John You are 100% correct,perhaps I did not state my s###w up properly,I ran the line from the intake manifold incorrectly to the tee @ the expansion tank then on to the upper heater core fitting,....the bottom line of the heater to the coolant shut off valve,then on to the water pump inlet fitting.Now with the control valve closed I think the hottest coolant from the intake manifold was forced into the expansion tank,at the same time the overflow line from the top of the radiator was also trying to feed high temp coolant in to the exp. tank,and at the same time any return coolant from the bottom heater fitting was sealed off (closed) by the control valve.If control valve was to open it would have allowed the hot coolant to be returned to the inlet of the water pump,which in my mind would only exasperate the heating problem. did I make it understandable ? The good news all is running cool(155/160* now. Hope this clears up BUBBA hook up! two hose hook up,three hose F up.
Francis